Pipe-threading apparatus



March 24, 1931. v J. v. JARDINE 1,797,422

PIPE THREADING APPARATUS Filed oct. 24, 1927 2 sheetsshee1 1 l NV E NTDE-,

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March 24, 1931. J, V. JARDlNE 1,797,422

i PIPE THREADING APPARATUS Filed'Oct. 24, 1927 2 Sheets-Sheet 2 INVENTDR.

25difterent sizes of threads of the Patented` Mar. `2li, 1931 JAMES vALTnN JARDINE, on HESPELER, ONTARIO, GANADAAssIGNoR To A. B. DINE a coiirPANYVLiMrrnn, or Hnsrnnnit, CANADA name2- iesrcn* y JAR PIPE-THREADING APPARATUS Application filed ctob|r'2, 1927. Serial No. 228,390.

'y This invention relates tov apparatus used for, threading pipe, rods and the like. The

chasers used in threading pipe are tapered,

so that the end of the pipe when threaded is `also tapered. Vith apparatus as heretofore used, the dies are stationary, with the result that as the threading proceeds, more and more' of the' threads of the cha-ser come into i engagement with the pipe, the first cut i@ threads being made gradually deeper and deeper in order to secure the tapered thread, anda gradually increasing amountofpower is yrequired to effect the cutting.

Y My chief object therefore is to devise ap- ]-5 paratus which will require a less amount of -power to drive and which will permit of more rapid operation.

As pipe iittingsmanufactured in different plants have not always exactlyl the same' .sizev ofthread, so thata given piece of pipe will have a loose fit with one batchof fittings and a tight fit with another batch, a further ob' ject of my invention is therefore to provide means whereby pipemay be out to suit the fittings employed. Y.

. A still furtherobject is to provide. conn venient means for removing the burr usually (if formed on the interior of the pipe during "o the cutting operation.

rI* attain my objects by mounting the diesV rso that they are radially slidabl'e in thefchaser f head and providing means for gradually retraoting the chasers' as the threadingprd ceeds, so that the cutting will allnbe performed by the first one or two threads, the

rate of retraction of the dies thus regulating the taper of the thread, and. in conjunction with kthese means I provide other means whereby the position ofthe chasers may be varied depending on whether the pipe being threaded is to be used withy fittings having a threadlarger or smaller than standard.

My apparatus is hereinafter more specilically described and illustrated in the accomY panying drawings in which n p Fig'. l is a plan View, partly broken away, v ofthe apparatus; Fig. 2 isa cross section;

Figa longitudinal section o n the line 8 3 inFig. 2;` and;`

nism.-v

In the drawingslike numerals of reference indicate corresponding parts in the different figures'. i

Fig. ta plan view ofthe trimming Vmechalis a supportwhich ismounted on shafts I 2 extending longitudinally of the machine 4with which my.threadingmechanism is eniployed.4 At. 'one 'side the' support l is provided with a clamp 3l bymeans of which it may be locked yin any rdesired position lon git'udinally of the shaft. This support has a Vhole formed therethrough in which is longitudinally slidable the tubular stein 3 of the die carrying head. This chaser carrying head 4L is provided with brackets v5 and v6 wherebythegchaser head is also supported directly by the shafts 2., V'Formed inthe head 4 area plurality of radial groovesy 7 in v,which are slidable the 'chasers 8.

Slidable longitudinally on the stem 3 is a Y leverA carrying member 9 '1n recesses or openf ings; 9a in which are pivoted intermediate their ends a plurality offcamlevers 10one for each Chaser. The Adie carrying head has holes 36 formed. therein through whicheX- tend one endof each of the levers 10, each of the saidl lever ends engaging in-a notch l1 formed in the side of a Chaser. n thus beseen that 'byrocking'tlie*levers the' chasers mayfbelmov'ed radiallyin the slots asdesired.

'lo actuate the levers lprovidethe leveri actuatingring 12, Whiohis slidable on the stein 3 and is slotted to form recesses 18 in alin'ement with the. openings 9av through which theleversextend.y -Across each recesseXtendt-wopins 14s ancll, the leverv lying between the pins.y .The cam levers kareinolined, preferably on the are of a circle,.at a small angle to the axis of the device so that as the ring 12 is ymoved away from the lever carrying-'member 9, ,throughtheir engagement lwith, the pins Hand 15, the levers are ,Y It will rocked on their pivot-s to slowly withdraw the chasers from the pipe being threaded,`

Y ythus producing the "angle yof the taperv in the thread which would not yresult if the chasers Inu were stationary. Adjacent their free ends the levers are each inclined at a sharp angle to the axis of the device, one side of the sharply inclined portion being Vengaged by the pin 14 to cause a rapid rocking of the lever to move the chaser out of contact with the pipe, the opposed surface being engaged by the pin 15 to cause a rapid rocking of the lever to move the Chaser back into threading position.

to form the tapered thread. Vhen the stemV is actuated in the opposite direction, the head engages the ring 12 moving .the latter away from the Chaser-carryinghead, to engage the pins 14 vwith the sharply inclined surfaces of the levers 10 to rock the latter to cause .the rapid retraction of the chasers to entirely disengage the latter from the pipe. A spring 18`mounted on a rod 19 and engaging the ring 12 and the support 1 tends to move theY ring in a direction to cause the operation of the levers 10 to advance the chasers. T his rod .19 hasv one end secured to the ring 12 and its other end is slidable through a hole in the support 1.

As set out in the statement of the objects of the invention, it isdesirable to provide means for adjustment 'whereby the pipe may Ybe provided with a tight or lo-ose7 thread to suit th-e iittings with whichthe pipe is employed. l attain this result by providing means forregulating the distanceV of the lever-'actuating ring 12 from the member 9 at the commencement of the cutting operation, which also regulates, of course, the distance ofthe chasers from `the axis of the pipe Y being threaded. On the end-of the rod 19 is a head 2O through which is threaded a set screw 2,1, which is adapted to engage the support 1 and thus limit the'movement of the rod and therefore .the movement of the ring I 1.2 towards the member 9. The head 2O is preferably formed with an indicator 22' adapted to co-operate with a scale 23 on a lng 23 integral with the support 1.

A. sleeve 2.4 is preferably vsecured to the member 9 by means of screws 25. A longitudinal sloty 26 is formed in thissleeve, through which slot extends a screw 27 threadvedinto "the Chaser-carrying head 4 to connect the parts together. The slot permits su'liicient limited movement, when the screw is sutiiciently loosened, .of the member 9 away from the head 4 to disengage the ends of the levers carrying a sleeve 34 in which the end of the pipe 35 or other part to be threaded is adapted to rotate.

The operation of the apparatus is as follows. The support` 1 ismoved along the shafts 2 until the chasers are engaged with the pipe, said support 1 is then locked to shaft 2 by means of the clamp 31, when by the rotation of the pipe and with the assistance. of lever 16 through the sliding stem 17, the chaser-carrying head 4, together with the member 9, on which the levers 10 are pivoted, and the sleeve 24 will be automatically dra-wn forward to thread the pipe. During this automatic feeding the ring 12 remains in the same relative position to support 1, being held by tie rod 19, and as the levers 10 are drawn through the ring 12, owing to the particular shape of the levers, the chasers are retracted at a rate to produce the desired taper in the thread. W' hen a thread ofsuiieient length has been cut, the lever 16 and stem 17 are rapidly moved in the reverse direction to engage the Vhead of the latter to engage vand cause the ring 12 to engage the sharply inclined surfaces adjacent the end of the levers 10 to rapidly rock the latter and cause the rapid retraction of the chasers and their disengagement o'f the pipe. This movement also brings head 4 and its component parts back tothe original position relative to the support 1. When the lever 16 is released, the spring 18 will return the ring 12 and through it the levers 10 and chasers 8 to normal position to thread the next length of pipe.

In cutting pipe into lengths, generally an inwardly directed burr is formed which itis desirable to remove. I therefore mount within the hollow stem 3 a trimmer 28. This trimmer is slidable in grooves 29 extending horizontally of the stem 9 and is providedwith a V-shaped end 30, Ywhich thus adapts the device for trimming purposes for any size pipe.

From the above description it will be seen that I have devised a pipe threading rapparatus which will satisfactorily attain the .objects of my invention as set out inthe preamble oft-his speciication.

l/Vhat I claim as my invention is:

1'. In threading apparatus, the combinaltionof a support; a chaser carrying head;

lever-actuating member and dtherother end engl'glllgthe support,y A

2; In` threadin'diaa'ratus the Combination of I'a support; a chaserrearrying head; threading chasers; movable radially of said head; Chaser-actuating levers pivoted -on `said-head ;y a lever-,actuating member; manually operable means for Causingrelative movement between the headand said member to Cause Jdie movement of the chasers; a rod having one end 'engaged with the lever-actu,-

yating member,v4 itsV other end. extending vthrough said support; a spring mounted on said rod, one end of said spring engaging the jlever-aetuating member and the other end engaging the support; ka head on the free end of said rod; and a set screw threadedthrough said head and adapted to engage thesupport.k n y 8. In threading apparatus, the combination of a support; a Chaser carrying head;

threading chasers movable radially of ,said head; Chaser actuating levers pivoted on said head; a lever-actuating member; manuallyv operable means for causing relativemovement between the head and said member to `cause the movement of the chasers; a rod having one end engaged with the lever-actuating f member, its other end extending through said support; a spring mounted on saidrod, one

end of said spring engaging the lever-aotuating member and the other end engagingV the support; a head on the free end of sa'id krod; aV set screw threaded'through said yhead and adapted to engage the support; a pointer on said head; and a scale on the support with which the pointer is adapted to eri-operate.

p 4. In threading apparatus, the combina' tion ofa support; a Chaser carrying head;

threading chasers movable radially of said head; Chaser-actuating levers pivot-ed on said head; a. lever-actuating member, said head 'and lever-actuating member being adapted toy be moved relative to one another, said support i and lever-actuating member having alined openings formed therein; a rod slidable through said openings, said rod having s ahead thereon adapted to engage and actuate either the lever-actuating member or the l.Chaser-earrying headto alter their relative positions; a lever'pivoted on said support and also pivotally Connected with said rod;`

' and spring means for movingsaid lever-actuating member Vtowards thel Chaser-carry; ing head. Y

Y 5. In threading apparatus, the combinationy of a non-rotatable support; a non-rotatable chaser-carrying headv slidable axially ofisaid support; a worlsupport in whichv Vthe work is free to rotate; Ythreading chasers movable radially of said headg-ehaser-aetuating yleverspivoted on said head; and lever actuating meansoperable while the 4Chasercarrying head issliding relative to the sup- Y port for yautomatically and positively roeking said levers to move .the chasers away from the work at a gradual rate during the threading operati'onto producea `tapered' thread.

6. In threading apparatus, the combination of' anon-rotatable.support; a non-rotatable Ichaser-oarrying head slidable axially ofV said support; threading Chaser-sf vmovable radially of said head; lChaser actuating levers pivoted on said head; leveraetuating; means operable whilethe Chaser-Carrying head is sliding relative `to ythe support for automatically Jand" positively rockingjsaidlevers to move theehasers away from the work at a gradual .rateo during the threading Y operation ltoproduoea tapered thread; and meansi'or l adjusting the f YistaneeA between said means and fthe Chaser-carryinghead.

7 InV threading apparatus,ftlie combination of a Yvn-on-rotatable. support; anon-rotatable Chaser V Carrying head slidablejaxially Voflsaidv support; threading chasers movable radially of saidhead; ehaser-:atuating levers pivotedon said head; alever actuating meniber Voperable `while the Chaser-,carrying head is slidingrelative ito Athe support tor; autoto move the chasers awayfrom the work atk a `gradiial rate during they threading -operation to. produce a 'tapered thread, said `men'iber being. movable relativeto thesupport a rstein eonneeted atv one/endy lwithsaid member; and

its'y other end slidable through said support;

head ;,c'hase'r aetuating leversfpivoted` onr said head, saidl'levers being operatively engaged with`theveh'a'sers whereby/,fthe latter maybe moved in either direetion'; a lever-actuating member`-slidable onsaid'stem; :and means` for member relative jtO, the support.

kadjus ting'the positio'nfof the lever atuating Vmatially and positively rocking said-,levers v I9. VvIn threading 'y apparatus, thel o tionof'a:non-rotatablesupport; a non-ro-` -tatable ohaserfearrying head 'slidable axiaL lyofv'saidfsiupport threading ehasersmovable radially of A said head; ehaser' aetuating'levers pivoted onsaid head ;a lever-*actuatingam-3m` Y ber movableA axially of said's`upport, said'levers^ being'shapedy to "cause irst -a/ lgradual withdrawal et .the'chasersto form a tapered thread ,and subsequently a rapid withdrawal of the" chasers; and means* adapted-:to iirst aetuating member to ef'feet said 4gradualy with-y kdrawal and to lsubsequently move thev lever move said Chaser head aWayfrom the lever .actuatin'g member away from the head 'to effect the rapid Withdrawal.v

10. In threading apparatus, the combination of a vnon-rotatable support; a non-rotatable Chaser-carrying headV slidable axially of said support; threading chasers movable radially of saidhead; Chaser actuating levers pivoted on said head; a lever-actuating member movable aXially of said support, said levers being shaped to cause first a gradual withdrawal of the chasers to form a talevers engaged by said means being curved longitudinally of the levers on a line adapted to maintain a substantiallyconstant rate of increase in the angle of the levers to the axis of the head during the threading operation. f

Signed at Preston this seventh day of October, 1927.

JAMES VALTEN JARDINE.

`pered thread yand subsequently a rapid withdrawal of the chasers; means adapted to first move said Chaser head away from the lever actuating member to e'ect said gradual withdrawal and to-subsequently move the lever actuating member away from the head to effect the rapid withdrawal; spring means tending `to move the lever-actuating member towards the head; and means Jfor limiting the movement of the lever actuating member positively rocking said levers to Vmove the 'y chasers away from the work at a, gradual rate during the threading operation to produce a tapered thread. T

yk12. rIn threading apparatus, the combination of ap non-rotatable support; a non-rotatable chasser-carrying head slidable axially vof said support; threading chasers movable radially of said head; levers pivotedv intermediate their ends on saidhead, said'chasers each having a'notch in its side into which one end of a lever extends; and lever-actuating meansengaging the other ends'of the levers and operable while the Chaser-carrying head is sliding Yrelative to the support for automatically and positively rocking said levers to move the chasers away from the work at a gradual rate -during the threading operationv to produce a tapered thread. y 13. In threading apparatus; the combination of a non-rotatable support; anon-rohe'a'dadapted to positively move said chasers v(Si) tatable chaser-carrying head slidableaxially ofsaid support; threading chasers movable radially ofsaid head; levers pi-voted on said away from the work; and lever-actuating vmeans independent of the work operable while the Chaser-carrying head is sliding relative to .the support for automatically and positively rockingV said levers to move the chasers away from the work at a gradual rate during the threading operation to produce a tapered thread7 the surfaces of the 

